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<?php function ReformatPhoneNumber($number) { if (!IsValidNumber($number)) { throw new \Exception('Invalid phone number'); } echo $number; } function IsValidNumber($number) { $validChars = array(' ', '-'); if (!is_numeric(substr($number, 0, 1)) || !is_numeric(substr($number, strlen($number) - 1, 1)) ) { return false; } return true; } echo ReformatPhoneNumber('012-345 69x');

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